Trial reportCancer epidemiology, biomarkers & prevention : a publication of the American Association for Cancer Research, cosponsored by the American Society of Preventive Oncology2014
Known and novel sources of variability in the nicotine metabolite ratio in a large sample of treatment-seeking smokers.
Trial report in Cancer epidemiology, biomarkers & prevention : a publication of the American Association for Cancer Research, cosponsored by the American Society of Preventive Oncology, 2014. The graph could read no effect estimate from its abstract, so it casts no vote on the map. It is linked to trial NCT01314001 (Pharmacogenetics of Nicotine Addiction Treatment), which is not on this map. Cited by 85 papers, 5 of them syntheses that pooled it.
What it found
Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.
The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Pharmacogenetics of Nicotine Addiction Treatment (PNAT)
Who cites it
85 citing papers in PubMed, 5 syntheses or guidelines pooled it, 120 citations in OpenAlex.
- Nicotine receptor partial agonists for smoking cessation.The Cochrane database of systematic reviews · 2023Pooled it
- Nicotine Metabolism Predicted by CYP2A6 Genotypes in Relation to Smoking Cessation: A Systematic Review.Nicotine & tobacco research : official journal of the Society for Research on Nicotine and Tobacco · 2022Pooled it
- Genome-wide association meta-analysis of nicotine metabolism and cigarette consumption measures in smokers of European descent.Molecular psychiatry · 2021Pooled it
- Nicotine receptor partial agonists for smoking cessation.The Cochrane database of systematic reviews · 2016Pooled it
- Sex Differences in Varenicline Efficacy for Smoking Cessation: A Meta-Analysis.Nicotine & tobacco research : official journal of the Society for Research on Nicotine and Tobacco · 2016Pooled it
- The Nicotine Metabolite Ratio and Response to Smoking Cessation Treatment Among People Living with HIV Who Smoke in South Africa.International journal of environmental research and public health · 2025Trial
- Evaluating mediators of the effect of varenicline preloading on smoking abstinence in a randomized controlled trial.Addiction (Abingdon, England) · 2025Trial
- Relationships Between the Nicotine Metabolite Ratio and Laboratory Assessments of Smoking Reinforcement and Craving Among Adults in a Smoking Cessation Trial.Nicotine & tobacco research : official journal of the Society for Research on Nicotine and Tobacco · 2024Trial
- A Cross-Sectional Analysis of the Nicotine Metabolite Ratio and Its Association with Sociodemographic and Smoking Characteristics among People with HIV Who Smoke in South Africa.International journal of environmental research and public health · 2023Trial
- Correlates of the nicotine metabolite ratio in Alaska Native people who smoke cigarettes.Experimental and clinical psychopharmacology · 2022Trial
- Comparing the Rate of Nicotine Metabolism Among Smokers With Current or Past Major Depressive Disorder.The American journal on addictions · 2021Trial
- Pregnancy-Induced Increases in the Nicotine Metabolite Ratio: Examining Changes During Antepartum and Postpartum.Nicotine & tobacco research : official journal of the Society for Research on Nicotine and Tobacco · 2019Trial
- Association of Reduced Nicotine Content Cigarettes With Smoking Behaviors and Biomarkers of Exposure Among Slow and Fast Nicotine Metabolizers: A Nonrandomized Clinical Trial.JAMA network open · 2018Trial
- Does menthol cigarette use moderate the effect of nicotine metabolism on short-term smoking cessation?Experimental and clinical psychopharmacology · 2017Trial
- Cessation of alcohol consumption decreases rate of nicotine metabolism in male alcohol-dependent smokers.Drug and alcohol dependence · 2016Trial
- The Nicotine Metabolite Ratio is Associated With Early Smoking Abstinence Even After Controlling for Factors That Influence the Nicotine Metabolite Ratio.Nicotine & tobacco research : official journal of the Society for Research on Nicotine and Tobacco · 2016Trial
- Nicotine Metabolite Ratio Is Associated With Lozenge Use But Not Quitting in Smokeless Tobacco Users.Nicotine & tobacco research : official journal of the Society for Research on Nicotine and Tobacco · 2016Trial
- Test-Retest Reliability and Stability of the Nicotine Metabolite Ratio Among Treatment-Seeking Smokers.Nicotine & tobacco research : official journal of the Society for Research on Nicotine and Tobacco · 2015Trial
- Use of the nicotine metabolite ratio as a genetically informed biomarker of response to nicotine patch or varenicline for smoking cessation: a randomised, double-blind placebo-controlled trial.The Lancet. Respiratory medicine · 2015Trial
- Article
25 more citing papers are in PubMed but not listed here.
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
8 authors at 1 institution in 1 country.
Funding
Abstract
backgroundThe ratio of 3'hydroxycotinine to cotinine, or nicotine metabolite ratio (NMR), is strongly associated with CYP2A6 genotype, CYP2A6-mediated nicotine and cotinine metabolism, and nicotine clearance. Higher NMR (faster nicotine clearance) is associated retrospectively with heavier smoking and lower cessation rates.
methodsNMR as a predictive biomarker of cessation outcomes is being investigated (NCT01314001). In addition to strong CYP2A6 genetic influences on NMR, demographic and hormonal factors alter NMR. Here, we analyzed, for the first time together, these sources of variation on NMR in smokers screened for this clinical trial (N = 1,672).
resultsParticipants (mean age = 45.9) were 65.1% Caucasian, 34.9% African American, and 54.8% male. Mean NMR (SD) was higher in Caucasians versus African Americans [0.41 (0.20) vs. 0.33 (0.21); P < 0.001], and in females versus males [0.41 (0.22) vs. 0.37 (0.20); P < 0.001]. Among females, birth control pill use (N = 17) and hormone replacement therapy (N = 14) were associated with 19.5% (P = 0.09) and 29.3% (P = 0.06) higher mean NMR, respectively, albeit nonsignificantly. BMI was negatively associated with NMR (Rho = -0.14; P < 0.001), whereas alcohol use (Rho = 0.11; P < 0.001) and cigarette consumption (Rho = 0.12; P < 0.001) were positively associated with NMR. NMR was 16% lower in mentholated cigarette users (P < 0.001). When analyzed together in a linear regression model, these predictors (each ≤2%) accounted for <8% of total NMR variation.
conclusionsAlthough these factors significantly affected NMR, they contributed little (together <8%; each ≤2%) to total NMR variation. IMPACT: Thus, when using NMR, for example, to prospectively guide smoking cessation therapy, these sources of variation are unlikely to cause NMR misclassification.
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Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.